Observation of55Mn NMR and NQR Signals from Site II in β Mn Metal

NMR and NQR signals of 55 Mn in site II were observed. The electric quadrupole coupling constant and the asymmetry parameter were estimated to be e 2 q Q / h =30 MHz and η∼0, respectively. The nuclear spin lattice relaxation rate, 1/ T 1 , is proportional to \(√T\), which indicates β Mn to be an itinerant antiferromagnetic system with T N ∼0 K. The value of 1/ T 1 at site II is about 20 times larger than the value at site I. The electronic state of Mn at site II is more magnetic than that at site I.